If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
Shake and Bake A new and increasingly widespread technique also known as one pot, this condenses the anhydrous method's many steps and requires only a plastic soda bottle, the size of which depends on the quantity of meth the cook intends to make.
Shake 'N Bake Mix - Low Carb Style - 2 cups dried onion 2 teaspoons kosher salt 1/2 teaspoon pepper blend 1/4 teaspoon cayenne pepper 1/4 teaspoon red pepper flakes 1/2 teaspoon ground sage 1 teaspoon dried rosemary 1 tablespoon sweet paprika 1 teaspoon dried thyme 1/2 teaspoon dried basil 2 bay leaves crushed 1 1/2 cups grated Parmesan cheese